I'm at one where the pool is under repair as well although I don't care.

However if it really means that much to you, I would call prior to arrival or in your case booking the hotel. Anything can happen to cause it to shut down but if they have scheduled maintence they should be able to tell you.

If you really want to get something out of them, email them in advance, get their response in writing and if they told you the wrong answer you might be able to hijack them into giving you some points.

The question really begs, what common area amenities is it reasonable to be expected to be in working order? If they are not, what would reasonable compensation be for something like that. I don't have an answer but it is a good question